bulloch



l(No Model.) 2 Sheets-Sheet 1.

R. H. BULLOCH.

MECHANICAL BOARD MEASURE CALCULATOR. l UNO. 324,078. Patented Aug. 11, 1885..

VIIII|| IIII|I [filtri lfnl A i (No Model.) 2 Sheets-Shee 2.

R. H. BULLOCH.

MBGHANIGAL BOARD MEASURE CALGULATGR. y No. 324,078. Patented Aug. 11, 1885.

. @d lJVVEJVgOR;

./ttorney N. PETERS, Pham-Li hogmpher. Wanhi UNITED STATES PATENT OFFICE.

ROBERT H. BULLOOH, OF SAVANNAH, GEORGIA, ASSIGNOR OF ONE-HALF TO FRANK O. GARMANY, OF SAME IJLAGE.

IVI ECHANICAL BOARD-M EASU RE CALCULATO R.

SPECIFICATION farming part of Letters Patent No. 324,078, dated August 11, 1885.

Applieatioirfilcd December l1, 1884. (No modi-l.)

T @ZZ whom, it may concern: 2) secured to the arm a. The rod e may be Be it known that I, ROBERT H. BULLocH, conveniently secured to armband projection g. a citizen of the United States, residing at Sa- The relation of the arms a and b is fixed,

vannah, in the county of Chatham and State and their juncture may be either rigid, as in ot' Georgia, have invented a certain new and Fig. l, or movable, as in Fig. 2, in which latuseful Mechanical Board-Measure Calculator, ter case a rulejoint will be effective to admit of which the following is a full, clear, and exofthe folding together of the device whennot act description. in use. l

The object of this invention is to provide a The parts of the device may be of wood, 63 1o mechanical device for ascertaining` very readmetal, rubber, or other suitable substance or ily the contents of a picceof board the length, material. breadth, and thickness of which are known. The several. arms a b c are graduated or pro- Tlie device is an improved form of old mevided with scales, which bear a fixed relation (-hanical calculators, specially applicable to to each other after the unit is once fixed, and r 5 the object above stated. in order that accurate results may be obtained The invention consists in two scales fixed at in the use of the scales it is essential that the a right angle, combined with athird scale movpointer or index should turn on a point in able with relation to one of the other sca-les, line with the zero-points of the scales; or, conand a pointer or index movable over one of versely, the zeros of the scales must be coin- 7o 2c the fixed scales, and also Vover the movable cident with the pivot of the index.

scale, to ascertain a desired result, as Iwill now The unit of measurementhaving been adoptproceed to specify, and particularly point out ed, the scale on arm c is laid ofi' in whole numin the claim at the end of this specification. bers, eighths, and twelfths, the scale on arm In the accompanying drawings, in the two Z) in whole numbers and eighths and thc scale 7 5 2 5 gures of which like parts are similarly desigon arm c in whole numbers and twelfths, and,

nated, Figure 1 is a plan view of the calcubesides the enumeration of the twelfths as` lator, and Fig. 2 a similar, view of a slightlysuch, an additional enumeration is given them modified form of construction, both being at 7a. which expresses totals of' twelfths, and

broken. will be hereinafter referred to as result-scale 8o 3o The mechanical parts of the device comprise 71.

an arm, a, a second arm, b, fixed at right an- T he graduations of arms c and c determine gles thereto, a third arm, c, so connected at the graduation of arm b as to length of divisright angles with 'arm a as to be movable lonions. Thus the spaces between units on arm gitudinally thereof, and a fourth arm, d, pivb are in length equal to as many subdivisions 3 5 oted or jointed to the arm c, and long enough oi' the scale c as are indicated by the whole to intersect the arms b and c. The arm c is, number of units on the scale on arm a, which as shown in Fig. l, connected to arm a by may be read from the passage of the arm c means of a rod, e, which it encircles, or to along it. In the example shown in Fig. l the which it is otherwise attached, so as to be arm a has fourteen divisions or units, each of 9o 4,0 movable lengthwise of said rod and arm, and which is subdivided into eighths and twelfths. the said arm c has a pointer-finger, j", over- Now, the units and subdivisions thereof of the lying the arm a. Instead of having the arm scale of arm c may be purely arbitrary as to c thus movably connected to arm c, I may length, but are preferably small, so as to bring make a loop in its end to encircle the said the calculator, within as small compass as pos- 45 arm c, as shown in Fig. 2, and in this form sible; but whatever these unitsorsubdivisions the pointeniinger j will be unnecessary. The thereof are, the units of the scale of arm l) scale c must be arranged to move at right anmust be equal in number to the number of gles with the arm a and parallel with arm b. subdivisions on scale on arm c, corresponding The pointer or index d may be a rigid arm with the number of units on scale on arm c, 10o 5o pivoted to a projection, g, of the arm a, (see whichin'thisinstance is fourteen. From these Fig. 1,) or it may be a cord or wire (sec Fig. facts and the Zero arrangement of index d it.

follows that the location ot' the arm f at a given pointon the scale of arm a, and the intersection 0l` the index cl with the arm b, will l give a ixed proportional location of the index on the arm c, and will enable the reading ofa thereby fixed fact from the scale ol" said arm c. To illustrate: Suppose it is desired to find the board-measure of a piece of lumber four inches wide by i'our inches thick by twelve feet long, the arm cis moved to the unitli: on scale a for the thickness, and the index Z is moved to the unit4 on scale?) for the width. rlhe reading-point of the index, if it be other than a line cord or wire, will be a line drawn through its length centrally of its pivot, (sce line 1,) and in this example said line intersects the scale on arm c at the point marked l'k, i'rom which it is learned that in cross-section the piece ol" timber is one foot and four inches, to which must be added the unit ot` lumber-measure-namely, one inch in thickness-so that the reading would be ltX T25. Now, this result determines the next operation', for it aseertains the number of board or lumber measure feet there are iu the crosssection of the piece of timber. The arm e is then moved on arm en t0 the point lt, and the index is moved to the unit ot' length ofl board on scale b, which in' this example is 12. NOW, by referring to arm c it will be found that the index intersects its scale at the point l l i and if that line be followed down to the l scale /z it will indicate 1,6, which will be the number of board feet in the board. This last,- result is omitted from the drawing in order that the View may be as large as possible.

By this means the contents of aboard are readily and accurately ascertained Without figuring and the mistakes incident to such mental operations, and the value of this calculator in cases Where there are fractions is specially great.

V hat I claim is- In a board-measure calculator, the two Fixed graduated arms at right angles one to the other, and a third graduated arm at right angles to one and parallel with the other and movable in parallel planes with relation to the latter, the said latter arm having its units of measurement equal in length to a number ot subdivisions ot the movable arm corresponding with the number of units on the arm to which the movable arm is connected, combi ned with an index or pointer intersectingthe movable arm and the arm to which it is parallel, substantially as and for the purpose described.

In testimony whereof I have hereunto setmy hand this 8th day of December, A. D. 1884.

ROBT. H. B ULLOCH.

XVi t nesses:

R. D. XVALKER, Jr., J. R. SA'UssY, Jr. 

